Starting Electronics needs your help! Please make a donation to help cover our hosting and other costs. Click the donate button to send a donation of any amount.

Op-amp Oscillator LED Flasher

Created on: 15 May 2013

A 741 op-amp is is configured as an oscillator in this circuit and used to flash an LED on and off. This is another easy circuit for beginners in electronics and can be built on an electronic breadboard.

Op-amp Oscillator Circuit Diagram

The oscillator part of the circuit consists of 4 resistors, 1 capacitor and an LM741 op-amp IC. The fifth resistor (R5) is a current limiting resistor for the LED.

In the circuit diagram below, the circuit is powered from 9V. This circuit should be able to operate over a range of voltages from 5V to 12V.

Op-amp oscillator / LED flasher circuit diagram
Op-amp Oscillator LED Flasher Circuit Diagram

The video below shows the circuit built on breadboard.

Can't see the video? View on YouTube →

Books that may interest you:

C Programming with Arduino Book Ultimate Arduino MEGA 2560 Hardware Manual Ultimage Arduino Uno Hardware Manual